Development of Actigraph GT1M Accelerometer Cut-Points for Young Children Aged 12-36 Months
Background: While numerous cut-points exist for preschoolers,cut points for children aged 12-36 months are limited.
Objective: To determine Actigraph GT1M cut-points for sedentary (SED), light (LPA) and moderate-vigorous physical activity (MVPA) in toddlers.
Methods: Twenty-three (10 boys, 13 girls) toddlers ranging in age from 12 months to 36 months (mean age of 19.5 ± 5.93) were asked to attend an adult-led structured play class. All participants wore the GT1M (Pensacola, Florida) secured using an elastic strap on their right hip. Accelerometer data collection was synchronized with direct observation of activity using the Children’s Physical Activity Form (CPAF). The CPAF categorizes activity on a scale of 1-4:1, stationary, no movement; 2, stationary with limb movement but no trunk movement (e.g. drawing); 3, slow trunk movement (e.g. walking); 4, rapid trunk movement (e.g. running). Receiver operating characteristic (ROC) curve analysis was performed to
determine accelerometer cut-points.
Results: For the GT1M, the SED cut-point was 0-181 (ROCAUC=0.98, 95% CI=0.93-0.99), LPA was 182-434, and MVPA ≥ 435 counts/15 sec (ROC-AUC=0.98, 95% CI=0.96-1.0).
Conclusion: The cut-points established for the GT1M can be used to quantify time toddlers spend in sedentary behavior and at different physical activity intensities.